IR-MQTT-ESP, IR multiple repeater using MQTT for ESP8266 and ESP32 microcontrollers

This is an Arduino sketch created in order to connect several devices and be able to retransmit IR signals among all devices using my ForoElectro.Net MQTT server.

You need one MQTT account: https://www.foroelectro.net/arduino/en/mqtt-doc

You can register it for free.

Compilation

You can compile the sketch using Arduino IDE with ESP8266 or ESP32 support.

Sketch upload

This sketch uses SPIFFS in order to store configurations. You need to set a minimal SPIFFS space when uploading. It only needs few kbytes.

Configuration is not encrypted, so take it in mind.

Usage

Once uploaded it will be a new WiFi open network available, called IR-MQTT-AP.

Connect to that AP, navigate to 192.168.4.1, set correct values and save.

After resetting itself it will be connected to your network.

If you compile it with debug enabled you will see a lot of info, as its IP, via serial monitor.

Hardware

You need one IR emitter (940nm) and one IR receiver. Also, an generic NPN transistor (BC547, 2N3904 or A42 are good examples).

• IR receiver: https://s.click.aliexpress.com/e/_dUhAFXX
• IR emitter: https://s.click.aliexpress.com/e/_dXUhbhx
• Transistor (pack): https://s.click.aliexpress.com/e/_dVthBh7
• Resistor, 10 to 100 Ohm (pack): https://s.click.aliexpress.com/e/_AUPOeB

In order to IR emitter work correctly you need the NPN transistor as stated here: https://github.com/crankyoldgit/IRremoteESP8266/wiki#ir-sending

By default:

• IR demulator is connected to GPIO14, D5 on NodeMCU.
• The base of transistor driving IR emitter is connected to GPIO4, D2 on NodeMCU.

You can change it using following variables on the code:

• IR demulator: kRecvPin
• IR emitter (base of transistor): kIrLed

Notes

Included PubSubClient library in order to incrase max packet size.

• Library page: https://pubsubclient.knolleary.net/
• Changed define: MQTT_MAX_PACKET_SIZE
• See more info here: https://pubsubclient.knolleary.net/api.html#configoptions

Config file (in SPIFFS and when accessing via web)

ssid = Your-WiFi-SSID
password = Your-WiFi-password
ApiKey = ApiKey-from-https://www.foroelectro.net/arduino/en/mqtt-doc
email = Email-registered-with-ApiKey
clientName = A-unique-name-for-the-device
topic = A-name-for-your-devices-group---ie-home

Who do I talk to?

• Naguissa
• https://www.foroelectro.net/proyectos-personales-f23/repetidores-de-infrarrojos-usando-esp-y-mqtt-t465.html
• https://www.naguissa.com

Contribute

Any code contribution, report or comment are always welcome. Don't hesitate to use GitHub for that.

• You can sponsor this project using GitHub's Sponsor button: https://github.com/Naguissa/IR-MQTT-ESP
• You can make a donation via PayPal: https://paypal.me/foroelectro

Thanks for your support.

Contributors hall of fame: https://www.foroelectro.net/hall-of-fame-f32/contributors-contribuyentes-t271.html